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**Physics exam tommarow NEED HELP!!!!!!!**

hows it going, im new to this forum and want to know how to do these problems for my exam tomorrow, thanks for the help in advance lets get to the questions:

1) three vectors have x and y component vectors as shown in the table below:

what is the magnitude of the resultant vector of: s+t+U?

x y

s -2.5 +4.5

T +3.0 -1.5

U +5.5 + 5.0

the choices for the answers are A)4.9 B)24 C)10 D)18 apparently the answer is C) but i am not sure how to get that

2) a boat, whose speed in still water is 8.0m/s, is moving up a river(against the current). If the speed of the current is 6.0m/s, how far up the river will the boat be 4.0 seconds later, relative to land?

A)4.0m B)8.0 C)16.0m D) 32.0m

Not sure how to do this problem but the answer is apparently B)